Development Tools
Here are some tools that you might find useful while developing code.
Tags
Tags are an index to the functions and global variables declared in a program.
Many editors, including Emacs and vi, can use them. The Makefile in
pintos/ produces Emacs-style tags with the command make TAGS or vi-style
tags with make tags.
In Emacs, use M-. to follow a tag in the current window, C-x 4 . in a new
window, or C-x 5 . in a new frame. If your cursor is on a symbol name for any
of those commands, it becomes the default target. If a tag name has multiple
definitions, M-0 M-. jumps to the next one. To jump back to where you were
before you followed the last tag, use M-*.
cscope
The cscope program also provides an index to functions and variables declared
in a program. It has some features that tag facilities lack. Most notably, it
can find all the points in a program at which a given function is called.
The Makefile in pintos/ produces cscope indexes when it is invoked as
make cscope. Once the index has been generated, run cscope from a shell
command line; no command-line arguments are normally necessary. Then use the
arrow keys to choose one of the search criteria listed near the bottom of the
terminal, type in an identifier, and hit Enter. cscope will then display
the matches in the upper part of the terminal. You may use the arrow keys to
choose a particular match; if you then hit Enter, cscope will invoke the
default system editor 1 and position the cursor on that match. To start a
new search, type Tab. To exit cscope, type Ctrl-d.
Emacs and some versions of vi have their own interfaces to cscope. For
information on how to use these interface, visit the cscope home page
(http://cscope.sourceforge.net).
1. This is typicallyvi. To exitvi, type:qEnter. ↩